Non-interchangeable contact parts.



PATENTED SEPT. 15, 1908.

R. HUNDHAUSEN.-

NON-INTERUHANGEABLE CONTACT PARTS.

APPLIOATION FILED FEB} 19, 1900.

N0 MODEL.

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Witnesses Inventor Rudolph Hundhausen.

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UNITED STATES Patented September 15, 1903.

PATENT OFFICE.

RUDOLF HUNDIIAUSEN, OF NVILMERSDORF, NEAR BERLIN, GERMANY, ASSIGNOR TO SIEMENS d5 I'IALSK E ELECTRIC COMPANY OF AMERICA, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

NON-INTERCHANGEABLE CONTACT PARTS.

SPECIFICATION forming part of Letters Patent N 0. 738,909, dated September 15, 1903.

Application filed February 19 1900. Serial No. 5.784. (No model.)

To (LZZ whom it nuty concern.-

Be it known that I, RUDOLFHUNDHAUSEN, a subject of the Emperor of Germany, residing at Wilmersdorf, near Berlin, Germany, have invented a certain new and useful Improvement in Non-Interchangeable Contact Parts, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

- The present invention relates to thermal cut-out devices for protecting electric circuits from excessive currents, and more particularly to the so-called non-interchangeable systems of fuse-plug cut-outs.

In the manufacture and installation of noninterchangeable systems of fuse-plugs it has been found desirable to make all or as nearly all as possible of the metallic parts of the receptacles of uniform dimensions and to provide the fuse-plugs of the larger capacities with correspondingly longer fuses and fusechambers than the fuse-plugs of small capacity. At the same time it has been found highly desirable and sometimes necessary, as in case the fuse-plugs are installed inshallow cabinets, that the outer ends of the f use-plugs with long chambers should not protrude out beyond the ends of the smaller fuse-plugs.

The object of my invention'is to provide a simple, inexpensive, and highly-efficient means which shall fulfil these requirements.

The invention will be readily understood upon reference to the following description and the accompanying drawings, forming a part of this specification, in WhlGh- Figures 1 and 2 are vertical sections of one type of fuse-plugs connected to their receptacles and provided with devices embodying one form of my invention for rendering them non-interchangeable, and Figs. 3 and 4 are vertical sections of an improved type of fuseplugs similarly connected.

In the construction shown in Fig. 1 the hollow insulating-base A has a cylindrical upper section 1 of large diameter, a long lower section 2 of less diameter, and an intervening shoulder 3. The upper end of the base is closed by a threaded metallic cap 4, which engages a screw-thread formed on the base,

and the long lower section 2 is surrounded by a threaded contact-sleeve 5. The lower end of the base carries a center contact-bolt 6, to the upper end of which the fuse 7 is attached. The fuse extends axially through the cavity to near the cap 4, where it turns and descends through an aperture 8 in the base A, parallel to its axis, and is attached at its outer end to the contact-sleeve 5. The lower end of the cavity and the aperture 8 are packed with some suitable cement.

The receptacle B comprises an internally preventing one of these plugs designed for large-capacity circuits from being inserted in the plug-receptacles of circuits of small capacity consists in providing the receptacle B of the small-capacity circuit with an auxiliary extension-ring C, having an inner diameter sufficient to permit of the free passage of the lower section of the plug and provided at its lower end with a counterbore which is tapped to engage the outer threads on the receptacle-ring 10. The plugs are provided with auxiliary metallic flanges 16, secured at different distances from their lower ends inversely proportional to the capacities of their fuses. It is apparent that if it were attempted to insert the plug shown in Fig. 2 in the receptacle shown in Fig. 1 its auxiliary flange 16 would abut against the upper end of the auxiliary ring 0 and prevent the center less than that shown in Fig. 1, and the auxiliary flanges 16 would be located accordingly.

In the construction shown in Figs. 3 and 4 the plugs are constructed, according to the capacity of the fuses they are to carry, with short upper sections and fuse-chambers and long lower sections for the fuses of small capacity and with long upper sections and fusechambers and short lower sections for the fuses of large capacity. By this arrangement the space which is wasted between the flange 16 and the shoulder 3 in the large-capacity fuse-plug of the type shown in Fig. 2 is made use of and a long fuse-chamber provided without increasing the total length of the plug.

The fuse-chamber of the plugs shown in Figs. 3 and 4 is divided, or nearly so, into two compartments by a central transverse web or partition 17, and the unoccupied spaces of the chamber are filled with a suitable powder 18.

The receptacles for the latter type of plugs is the same as that above described ,except that {the center contact is provided with a larger insulating-knob 14', which entirely prevents a plug of the first type being inserted in a receptacle designed for the second type of plug.

What I claim isl. A device of the class specified, comprising a socket-base and plug having an end portion adapted to fit into said socket-base, and also having its upper end enlarged, and a ring screw-threaded upon the upper end of the socket-base and constructed with a portion of smaller bore so that the upper portion of the ring is interposed between the top of the socket-base and the bottom of the enlarged portion of the plug, substantially as described.

2. A device of the class specified, comprising a socket-base, a plug having its lower end screw-threaded so as to fit into said base and tended around the partition, a contact con nected with one end of the fuse and extended through the wall of the casing, a second contact connected with the other end of the fuse and extended through the end of the plug, a ring screwthreaded upon the top of the socketbase and having its upper portion adapted to form a shoulder or abutment for the bottom of the casing formed by the upper end of the plug, substantially as described.

3. In a system of non-interchangeable contact plugs and sockets, the combination with socket-bases, of plugs having end portions adapted to fit into the socket-bases, and rings or sleeves of different heights removably placed between the plugs and sockets and surrounding the same, substantially as described.

4. In a system of non-interchangeable contact plugs and sockets, the combination with socket-bases, of plugs having end portions adapted to fit into the socket-bases, and rings or sleeves of different heights removably placed between the plugs and sockets and surrounding the same, the plugs having shoulders for engaging the rings or sleeves, substantially as described.

In witness whereof I hereunto subscribe my my name this 26th day of January, A. D. 1900.

RUDOLF I-IUNDHAUSEN. Witnesses:

WOLDEMAR HAUPT, HENRY HASPER. 

